w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 59
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w83l950d
Manufacturer Part Number
w83l950d
Description
Peripheral Personal Computer Keyboard Controller
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83L950D.pdf
(105 pages)
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(f(X
GP47/SRDY1/S1
IN
GP46/SCLK1/OBF10
) in low speed mode)
GP44/RXD
GP4
13. SERIAL I/O
13.1 Serial I/O 1
Serial I/O1 can be used as either clock synchronous or asynchronous (UART) serial I/O. A dedicated
timer is also provided for baud rate generation.
13.1.1 Clock Synchronous Serial I/O Mode
Note: There is an extra clock pulse between each data byte, please ensure if target device support this
behavior.
Clock synchronous serial I/O1 mode can be selected by setting the serial I/O1 mode selection bit of the
serial I/O1 control register (SIO1CON) to '1”.
For clock synchronous serial I/O, the transmitter and the receiver must use the same clock If an internal
clock is used, transfer is started by a write signal to the TB/RB.
f(XIN)
5
/TxD
BRG count source selection bit
F/F
1/4
Fig.12.1 Clock Synchronous Serial I/O Mode Block Diagram
Receive buffer register
Receive shift register
Falling-edge detector
Transmit buffer register
Data bus
Transmit shift register
Data bus
Shift clock
Address 0018
Baud rate generator
Address 001C
Serial I/O1 synchronous
Clock selection bit
Frequency division ratio 1/(n*1)
- 50 -
Shift l k
Address 0018
Clock control circuit
16
16
Clock control ciruit
Serial I/O1 control register
16
Receive buffer full flag (RBF)
Serial I/O1 status register
1/4
Transmit Interrupt source selection bit
Receive Interrupt request (RI)
Transmit shift completion flag (TSC)
W83L950D
Transmit buffer empty flag (TBE)
Transmit interrupt request
Address 001A
Address 0019
16
16
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